Expansive rubber bucket for chain-pumps



(No Model.)

0. H. MILLER.

EXPANSIVE RUBBER BUCKET FOR CHAIN PUMPS.

No. 269,809. Patented De0.26, 1882.

Wilda/eases.

N FETERS, Photwlhhognphw, vii-"mm. n. cy

UNt'rEE STATES P TENT Fate-E.

CHARLES H. MILLER, or COLUMBUS, OHIO.

.EXPANSIVE RUBBER BUCKET FOR CHAIN-PUMPS.

SPECIFICATION forming part of Letters Patent No. 269,809, dated.December 26, 1882. Application filed August 21, 1882. (No model.)

To all whom it may concern. I

Be it known that I, CHARLES H. MILLER, a citizen of the United States ofAmerica, residingat Columbus, in the county of Franklin and State ofOhio, have invented certain new and useful Improvements in ExpansiveRubber Buckets tor Chain-Pumps, of which the following is aspecification, reference being had therein to the accompanying drawings.

My invention relates to an improvement in expansive rubber buckets forchain-pumps;

and it consists in the combination of the screwthreaded stem,which ismade elliptical in crosssection, with the'cap having a cavity in itslower end, and the expanding coue,which has its smaller end forgedupward into the expansible cap, as will be more fullydescribedhereinai'tcr.

Figure l is a vertical section of a bucket which embodies my invention.Fig. 2 horizontal cross-section of the link alone.

LetterA represents a solid link of malleable galvanized iron, moldedwith a deep screwthread around its central rod, between the flangedloops on both its ends.

The rod a, around which the screw thread winds, is elliptic; but thethread surrounding it-does not partake oi that form, being circular inits outline, as shown in cross-section in Fig. 2. The elliptic form isgiven to the rod a for the purpose of holding an elastic nut atauy turndesired.

A vulcanized rubber nut, B, in the form of a truncated cone, molded witha hole through its center that is threaded to exactlyh't the thread onthe rod a, is screwed on the link is a,

with its base toward the flange on the lower loop. The elasticity ofsuch a nut is sufiicient to allow it to be turned past the ridges on thebed ofthe screw, and to spring back, afterpassing over them, to itsoriginal form and fasten itself firmly.

The upper part of the valve or bucket consists of a cap, 0, also made ofvulcanized rubber, is semi-globular in form, and molded hollow. Thecavity in the cap is of a diameter to just admit the truncated end ofthe conical nut, which, when screwed up, penetrates deeper into it andexpands the bucket to compensate for wear.

To fit a larger bore of a tube the rubber nut may be made cup-shaped,when, by turning the nut upward, its edges are made to bear against andexpand the lower rim of the cappiece. Both these methods of expandingthe buckets preserve the life of the rubber and insure its durability bybeing completely protected against the injurious action of the reel, bywhich so many buckets have been destroyed.

Having thus described my invention, I claim- The combination of thescrew-threaded stem (0, made elliptical in cross-section, with the coneB, and the cap 0, having a cavity in its under side, substantially asshown and described.

In testimony whereot'I affix my signature in presence of two witnesses.

CHARLES H. MILLER.

Witnesses:

JAMES WA'rsoN, T. M. LIvEsAY.

